US7445079B2 - Automatic calibration of vehicle transmission using load sensing - Google Patents

Automatic calibration of vehicle transmission using load sensing Download PDF

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US7445079B2
US7445079B2 US11/285,488 US28548805A US7445079B2 US 7445079 B2 US7445079 B2 US 7445079B2 US 28548805 A US28548805 A US 28548805A US 7445079 B2 US7445079 B2 US 7445079B2
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vehicle
ride height
transmission
change
magnitude
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US20070114091A1 (en
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Jeffrey J. Biallas
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Priority to DE102006054171A priority patent/DE102006054171A1/en
Priority to CN200610160449A priority patent/CN100582530C/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
    • F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/50—Inputs being a function of the status of the machine, e.g. position of doors or safety belts
    • F16H59/52—Inputs being a function of the status of the machine, e.g. position of doors or safety belts dependent on the weight of the machine, e.g. change in weight resulting from passengers boarding a bus

Definitions

  • the present invention relates to transmission control systems, and more particularly to automatically calibrating vehicle transmissions using load sensing.
  • Calibrating an automatic transmission of a vehicle requires determining gear shift points, shift times, shift sequences, etc., for various conditions, such as changes in throttle position, load, altitude, temperature, etc., that the vehicle may encounter.
  • vehicle system parameters such as throttle position history, ride height, etc., may be used to calibrate a transmission of a vehicle.
  • a ride height of a vehicle is a distance between ground and a specified point on the chassis, suspension, or body of a vehicle. As a vehicle is loaded, the vehicle body lowers, and the vehicle suspension deflects. Thus, the ride height of a vehicle changes as the load changes.
  • the ride height may also change when the road conditions change. For example, on a rough road, the ride height may change when the vehicle encounters bumps.
  • the changes in ride height can be measured by installing load sensors, such as ride height sensors, in the suspension of the vehicle.
  • the ride height data is typically used in suspension control systems to improve ride comfort.
  • the sensor detects changes in the suspension height of a vehicle and sends a signal to a control module that raises or lowers the suspension to ensure a smoother, level ride.
  • the ride height data has not been used to automatically calibrate vehicle transmissions.
  • the present invention provides a method for automatically calibrating a transmission of a vehicle using load sensing, comprising sensing a change in ride height of the vehicle, measuring a magnitude of the change in ride height of the vehicle, selecting a predefined set of parameters to calibrate the transmission depending on the magnitude of the change in ride height, and calibrating the transmission using the selected predefined set of parameters.
  • the method comprises defining a plurality of sets of parameters to calibrate the transmission of the vehicle.
  • the method comprises defining a threshold for the magnitude of the change in ride height of the vehicle.
  • the method comprises determining whether the magnitude of the change in ride height exceeds a predefined threshold.
  • the method comprises, selectively displaying ride height and the magnitude of the change in ride height of the vehicle to indicate unsafe and overloaded vehicle conditions.
  • the method comprises selectively calibrating the transmission manually.
  • FIG. 1 is a functional block diagram illustrating an exemplary control system for automatically calibrating a transmission of a vehicle according to the present invention
  • FIG. 2 is a flowchart illustrating an exemplary method for automatically calibrating a transmission of a vehicle according to the present invention.
  • module, controller and/or device refers to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, and other suitable components that provide the described functionality.
  • ASIC application specific integrated circuit
  • processor shared, dedicated, or group
  • memory that execute one or more software or firmware programs
  • combinational logic circuit and other suitable components that provide the described functionality.
  • the system 10 includes at least one load sensor 12 , such as a ride height sensor, installed in the suspension of a vehicle (not shown).
  • the sensor 12 detects a change in the ride height of the vehicle when the load and road conditions vary.
  • a control module 16 measures the magnitude of the change in ride height detected by the sensor 12 .
  • the control module 16 compares the magnitude of the change in ride height to a predefined threshold that is stored in the memory (not shown) in the control module 16 .
  • a predefined threshold that is stored in the memory (not shown) in the control module 16 .
  • the control module 16 selects one of the predefined sets of parameters, or shift maps, to calibrate the transmission 20 of the vehicle.
  • the parameters in a shift map control different functions of a transmission 20 such as gear shift times, shift schedules, etc. These parameters are defined by a calibrator (not shown) when the transmission 20 is manufactured and calibrated for various conditions, such as changes in throttle position, load, altitude, temperature etc. Notably, the calibration of a transmission can be effected in the form of step or variable control changes.
  • the parameter values in the shift maps can be defined accordingly.
  • the shift maps are stored in the memory in the control module 16 in the form of look-up tables.
  • the control module 16 uses the parameters in the selected shift map and calibrates the transmission 20 by modifying gear shift time, shift sequence, etc., according to the parameter values in the shift map.
  • control system 10 provides an indicator module 22 that displays the ride height information for the driver of the vehicle.
  • This feature can be useful in some situations.
  • the ride height status indicator can warn the driver of an unsafe or overloaded vehicle condition.
  • the control system 10 also provides an optional manual override module 24 that allows the driver to override the automatic calibration control and manually input the desired calibration parameters. This feature can be useful in some situations. For example, when the vehicle pulls a load such as a trailer, the load does not vertically compress the suspension. Consequently, the ride height does not change proportionally to the load pulled. As a result, the automatic calibration may not function properly and manual calibration may be preferred. Mountainous driving is another example where the manual calibration option may be desirable.
  • a method 30 for automatically calibrating a transmission of a vehicle using load sensing begins at step 32 .
  • a load sensor 12 such as a ride height sensor, detects a change in the ride height of a vehicle when the load and road conditions vary.
  • a control module measures the magnitude of the change in ride height.
  • step 36 the control module 16 checks whether manual override control 24 is in use. If the manual override control 24 is in use, the control system 10 does not automatically control the calibration of transmission 20 . Instead, in step 38 , the driver of the vehicle manually inputs the desired calibration selection to control the operation of the transmission 20 .
  • step 40 the control module 16 checks whether the magnitude of the change in ride height exceeds a predefined threshold. If the magnitude of the change in ride height is less than the threshold, then a change in calibration is not necessary, and in step 42 , the control module 16 continues to operate the transmission 20 using current calibration.
  • control module 16 selects a new set of calibration parameters, or a new shift map, from a shift map look-up table stored in the memory in the control module 16 .
  • the control module 16 selects the shift map depending on the magnitude of the change in ride height or depending on the calibration selection manually input by the driver.
  • step 46 the control module 16 calibrates the transmission 20 using the parameter values in the selected shift map by modifying gear shift time, shift sequence, etc., according to the parameter values in the selected shift map.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

A method for automatically calibrating a transmission of a vehicle using load sensing includes sensing a change in ride height of the vehicle and measuring a magnitude of the change in ride height of the vehicle. The method includes selecting a predefined set of parameters to calibrate the transmission depending on the magnitude of the change in ride height and calibrating the transmission using the selected predefined set of parameters.

Description

FIELD OF THE INVENTION
The present invention relates to transmission control systems, and more particularly to automatically calibrating vehicle transmissions using load sensing.
BACKGROUND OF THE INVENTION
Calibrating an automatic transmission of a vehicle requires determining gear shift points, shift times, shift sequences, etc., for various conditions, such as changes in throttle position, load, altitude, temperature, etc., that the vehicle may encounter. A variety of vehicle system parameters, such as throttle position history, ride height, etc., may be used to calibrate a transmission of a vehicle.
A ride height of a vehicle is a distance between ground and a specified point on the chassis, suspension, or body of a vehicle. As a vehicle is loaded, the vehicle body lowers, and the vehicle suspension deflects. Thus, the ride height of a vehicle changes as the load changes. The ride height may also change when the road conditions change. For example, on a rough road, the ride height may change when the vehicle encounters bumps.
The changes in ride height can be measured by installing load sensors, such as ride height sensors, in the suspension of the vehicle. The ride height data is typically used in suspension control systems to improve ride comfort. For example, the sensor detects changes in the suspension height of a vehicle and sends a signal to a control module that raises or lowers the suspension to ensure a smoother, level ride. The ride height data, however, has not been used to automatically calibrate vehicle transmissions.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a method for automatically calibrating a transmission of a vehicle using load sensing, comprising sensing a change in ride height of the vehicle, measuring a magnitude of the change in ride height of the vehicle, selecting a predefined set of parameters to calibrate the transmission depending on the magnitude of the change in ride height, and calibrating the transmission using the selected predefined set of parameters.
In another feature, the method comprises defining a plurality of sets of parameters to calibrate the transmission of the vehicle.
In another feature, the method comprises defining a threshold for the magnitude of the change in ride height of the vehicle.
In still another feature, the method comprises determining whether the magnitude of the change in ride height exceeds a predefined threshold.
In another feature, the method comprises, selectively displaying ride height and the magnitude of the change in ride height of the vehicle to indicate unsafe and overloaded vehicle conditions.
In another feature, the method comprises selectively calibrating the transmission manually.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
FIG. 1 is a functional block diagram illustrating an exemplary control system for automatically calibrating a transmission of a vehicle according to the present invention;
FIG. 2 is a flowchart illustrating an exemplary method for automatically calibrating a transmission of a vehicle according to the present invention.
 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. For purposes of clarity, the same reference numbers will be used in the drawings to identify similar elements. As used herein, the term module, controller and/or device refers to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, and other suitable components that provide the described functionality.
Referring now to FIG. 1, a system 10 for automatically calibrating a transmission of a vehicle using load sensing is shown. The system 10 includes at least one load sensor 12, such as a ride height sensor, installed in the suspension of a vehicle (not shown). The sensor 12 detects a change in the ride height of the vehicle when the load and road conditions vary.
A control module 16 measures the magnitude of the change in ride height detected by the sensor 12. The control module 16 compares the magnitude of the change in ride height to a predefined threshold that is stored in the memory (not shown) in the control module 16. When the magnitude of the change in ride height exceeds the predefined threshold, a change in calibration is necessary, and depending on the magnitude of the change in ride height, the control module 16 selects one of the predefined sets of parameters, or shift maps, to calibrate the transmission 20 of the vehicle.
The parameters in a shift map control different functions of a transmission 20 such as gear shift times, shift schedules, etc. These parameters are defined by a calibrator (not shown) when the transmission 20 is manufactured and calibrated for various conditions, such as changes in throttle position, load, altitude, temperature etc. Notably, the calibration of a transmission can be effected in the form of step or variable control changes. The parameter values in the shift maps can be defined accordingly. The shift maps are stored in the memory in the control module 16 in the form of look-up tables.
The control module 16 uses the parameters in the selected shift map and calibrates the transmission 20 by modifying gear shift time, shift sequence, etc., according to the parameter values in the shift map.
Optionally, the control system 10 provides an indicator module 22 that displays the ride height information for the driver of the vehicle. This feature can be useful in some situations. For example, the ride height status indicator can warn the driver of an unsafe or overloaded vehicle condition.
The control system 10 also provides an optional manual override module 24 that allows the driver to override the automatic calibration control and manually input the desired calibration parameters. This feature can be useful in some situations. For example, when the vehicle pulls a load such as a trailer, the load does not vertically compress the suspension. Consequently, the ride height does not change proportionally to the load pulled. As a result, the automatic calibration may not function properly and manual calibration may be preferred. Mountainous driving is another example where the manual calibration option may be desirable.
Referring now to FIG. 2, a method 30 for automatically calibrating a transmission of a vehicle using load sensing is shown. The method 30 begins at step 32. In step 34, a load sensor 12, such as a ride height sensor, detects a change in the ride height of a vehicle when the load and road conditions vary. In step 35, a control module measures the magnitude of the change in ride height.
In step 36, the control module 16 checks whether manual override control 24 is in use. If the manual override control 24 is in use, the control system 10 does not automatically control the calibration of transmission 20. Instead, in step 38, the driver of the vehicle manually inputs the desired calibration selection to control the operation of the transmission 20.
If, however, the manual override control 24 is not in use, then in step 40, the control module 16 checks whether the magnitude of the change in ride height exceeds a predefined threshold. If the magnitude of the change in ride height is less than the threshold, then a change in calibration is not necessary, and in step 42, the control module 16 continues to operate the transmission 20 using current calibration.
If, however, the magnitude of the change in ride height exceeds the threshold, then a change in calibration is necessary, and in step 44, the control module 16 selects a new set of calibration parameters, or a new shift map, from a shift map look-up table stored in the memory in the control module 16. The control module 16 selects the shift map depending on the magnitude of the change in ride height or depending on the calibration selection manually input by the driver.
In step 46, the control module 16 calibrates the transmission 20 using the parameter values in the selected shift map by modifying gear shift time, shift sequence, etc., according to the parameter values in the selected shift map.
Those skilled in the art can now appreciate from the foregoing description that the broad teachings of the present invention can be implemented in a variety of forms. Therefore, while this invention has been described in connection with particular examples thereof, the true scope of the invention should not be so limited since other modifications will become apparent to the skilled practitioner upon a study of the drawings, the specification, and the following claims.

Claims (8)

1. A method for automatically calibrating a transmission of a vehicle using load sensing, comprising:
sensing a change in ride height of the vehicle;
measuring a magnitude of the change in ride height of the vehicle;
selecting a predefined set of parameters to calibrate the transmission depending on the magnitude of the change in ride height;
calibrating the transmission using the selected predefined set of parameters; and
selectively displaying ride height and the magnitude of the chance in ride height of the vehicle to indicate unsafe and overloaded vehicle conditions.
2. The method of claim 1 further comprising defining a plurality of sets of parameters to calibrate the transmission of the vehicle.
3. The method of claim 1 further comprising defining a threshold for the magnitude of the change in ride height of the vehicle.
4. The method of claim 1 further comprising determining whether the magnitude of the change in ride height exceeds a predefined threshold.
5. The method of claim 1 further comprising selectively calibrating the transmission manually.
6. A system for automatically calibrating a transmission of a vehicle using load sensing, comprising:
a sensor that detects a change in ride height of the vehicle while the vehicle is stationary;
a control module that measures a magnitude of the change in ride height of the stationary vehicle and depending on said magnitude selects one of a plurality of predefined sets of parameters to calibrate the transmission of the vehicle when said magnitude exceeds a predefined threshold; and
an indicator module that selectively displays ride height and the magnitude of the change in ride height of the vehicle to indicate unsafe and overloaded vehicle conditions.
7. The system of claim 6 wherein the control module calibrates the transmission of the vehicle using the selected parameters.
8. The system of claim 6 further comprising a manual override module that selectively enables manual calibration of the transmission.
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DE102006054171A DE102006054171A1 (en) 2005-11-21 2006-11-16 Automatic calibration of a vehicle transmission using a charge detection
CN200610160449A CN100582530C (en) 2005-11-21 2006-11-21 Automatic calibration of vehicle transmission using load sensing

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US20090312146A1 (en) * 2008-06-16 2009-12-17 Zf Friedrichshafen Ag Method for controlling an automatic transmission and transmission control system
US7899584B2 (en) * 2007-02-28 2011-03-01 Caterpillar Inc. Method of controlling a vehicle based on operation characteristics
US20120078477A1 (en) * 2009-06-19 2012-03-29 Toyota Jidosha Kabushiki Kaisha Vehicle control device and vehicle control method
US11241977B1 (en) 2020-10-12 2022-02-08 Toyota Motor North America, Inc. Systems and methods for determining the presence of occupants left behind in a vehicle

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CN105424378A (en) * 2015-11-10 2016-03-23 中国北方车辆研究所 Vehicle load detection assembly
FR3101721B1 (en) * 2019-10-07 2021-09-24 Psa Automobiles Sa VEHICLE INCLUDING A NAVIGATION DEVICE TAKING INTO ACCOUNT THE GROUND CLEARANCE OF THE VEHICLE
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US20070114091A1 (en) 2007-05-24
CN100582530C (en) 2010-01-20
CN1971097A (en) 2007-05-30
DE102006054171A1 (en) 2007-06-21

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